This article attempts to evidence the idea that progress in social theory is impeded by central theoretical procedures embodying a host of conceptual mistakes. The article focuses on realist theorizing, examining both early realist work on science and contemporary critical realism, and demonstrates how conceptual procedures employed therein lead to error and confusion. The standard use of these procedures entails, among other things, that social theoretical debates tend to remain irresolvable and that understanding of what it takes to demonstrate a theoretical scheme as superior remains poor. Alternative ways of proceeding are outlined, which lead to defensible social theoretical practice.